* {
  margin: 0;
  padding: 0;
}

ul,
li {
  list-style: none;
}

.footer,
.header {
  width: 1200px;
  height: 80px;
  margin: 0 auto;
  background-color: skyblue;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 40px;
  color: #fff;
}

.footer {
  height: 300px;
  font-size: 100px;
}

.content {
  width: 1200px;
  padding: 10px 0;
  margin: 0 auto;
}

ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-around;
}

li {
  width: 280px;
  border: 1px solid #333;
  padding-bottom: 10px;
  margin-bottom: 10px;
}

li > img {
  width: 280px;
  height: 320px;
  display: block;
}

li > p {
  padding-left: 10px;
  padding-top: 10px;
}

.filter {
  height: 50px;
  width: 1200px;
  margin: 0 auto;
  display: flex;
  font-size: 20px;
  align-items: center;
}

.filter > p {
  padding: 5px 20px;
  margin: 0 10px;
  background-color: skyblue;
  cursor: pointer;
}

.filter > p.disable {
  background-color: #ccc;
  cursor: not-allowed;
}

.filter > select {
  padding: 5px 10px;
  font-size: 20px;
}
